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PDF AAT2401 Data sheet ( Hoja de datos )
| Número de pieza | AAT2401 | |
| Descripción | Sixteen-Channel White LED Driver Solution | |
| Fabricantes | Skyworks | |
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DATA SHEET
AAT2400/2401
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
General Description
The AAT2400/2401 is a highly integrated, high efficiency
white LED backlight solution for large size LCD panels
used in LCD TVs. To accommodate power requirements,
the solution consists of two devices, a master device
(AAT2400) and a slave device (AAT2401). The devices
operate from a regulated 24V DC power supply. The
master device supplies a 40V rail to drive 10 series LEDs
with a typical VF of 3.6V. 16 precision current sinks split
evenly between the master and slave devices provide
constant current drive for up to 160 white LEDs.
A SPI compatible interface operates up to 30MHz, allow-
ing fast, independent digital control of each current sink.
Full scale LED current is programmed from 30mA to
100mA using an external resistor. LED brightness varia-
tion is compensated by setting relative current sink mag-
nitudes with an 8-Bit Dot Correction register for each
LED current sink.
The AAT2400/2401 provides a 12-bit programmable
phase delay per LED current sink that can be used to
synchronize the LEDs to VSYNC. Device addressing pro-
vides for up to 256 LED strings. A 12-bit programmable
Gray Scale PWM brightness setting is generated via a
clock from a PLL synchronized to VSYNC, or from the
external GSCLK pin.
The AAT2400/2401 provides fault handling and fault
reporting through the interface. If LEDs are shorted on
one or more strings, the current sinks will maintain
operation due to the high voltage rating of the outputs.
However, a fault condition will be reported on the open
drain Fault pin. Similarly, if an open circuit is detected or
an over-temperature condition arises, the fault is report-
ed on the Fault pin. When a fault is reported, the nature
of the fault condition can be read through the serial
interface.
The AAT2400 boost converter provides an output voltage
regulated by the string with the highest voltage require-
ment allowing a wide range of LED characteristics, while
maintaining the lowest possible power dissipation. The
boost switching frequency is 600kHz to allow for opti-
mum efficiency with the smallest external filter.
Alternatively, the device may be synchronized to an
external clock. Current mode control provides fast
response to line and load transients. Thermal protection
circuitry shuts down the boost converter and the current
sinks in the event of an over-temperature condition.
The AAT2400 and AAT2401 are available in Pb-free, ther-
mally enhanced 36-pin 5x5mm TQFN packages.
Features
• VIN Range: 10.8V – 28V
• Integrated Boost Converter
▪ VOUT(MAX): 40V
▪ IOUT(MAX): 1.6A
• Up to 95% Efficiency
• Switching Frequency Options
▪ 600 kHz
▪ Sync to External Clock (optional)
• 16 LED Current Sinks up to 100mA/ch
▪ ±2.5% Accuracy (60mA)
▪ ±2.0% Matching (60mA)
• SPI Interface
▪ Digitally Programmable Individual Channels
▪ Up to 30MHz Clock Speed
▪ Read/Write Registers
• Precision PWM Digital Brightness Control
▪ 12-bit Individual Gray Scale PWM Brightness
▪ 12-bit Individual Channel Phase Delay
▪ 8-bit Individual Current Setting (Dot Correction)
▪ VSYNC Derived Internal Oscillator
• VSYNC PWM and Delay Synchronization
• Device Addressing
▪ 16 Possible Address Settings
▪ Up to 256 Current Sinks
• Fault Reporting
• Integrated Fault Protection
▪ Open/Short LED(s)
▪ Current Limit Protection
▪ Over-Voltage Protection
▪ Over-Temperature Protection
• Soft-Start to Minimize Inrush Current
• TQFN55-36 Low Profile Package
• -40°C to +85°C Temperature Range
Applications
• Large Size LCD TV, Panels
• White LED Backlight
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202307A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 24, 2012
1
1 page  
Pin Configuration
DATA SHEET
AAT2400/2401
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
AAT2400
TQFN55-36
(Top View)
AAT2401
TQFN55-36
(Top View)
CS5 1
CS6 2
CS7 3
CS8 4
SGND 5
CS4 6
CS3 7
CS2 8
CS1 9
36 35 34 33 32 31 30 29 28
10 11 12 13 14 15 16 17 18
27 PGND
26 PGND
25 LX
24 LX
23 N/C
22 SYNC
21 CSFB
20 COMP
19 SDO
CS5 1
CS6 2
CS7 3
CS8 4
SGND 5
CS4 6
CS3 7
CS2 8
CS1 9
36 35 34 33 32 31 30 29 28
10 11 12 13 14 15 16 17 18
27 AGND
26 AGND
25 AGND
24 AGND
23 CSFB1
22 AGND
21 CSFBO
20 AGND
19 SDO
Absolute Maximum Ratings1
TA = 25OC unless otherwise noted.
Symbol
VLX
VIN,EN
VCSx
VCC
OVP, COMP, SYNC, VSYNC, GSCLK, RSET,
SDI, SDO, SCLK, CS B, PLL, FLAUT,
CSFB, CSFBi, CSFBo, ADDR0, ADDR1
IOUT
TJ
TLEAD
Description
LX Voltage to GND
Input Voltage, EN to GND
Output current sinks CS1 – CS16 to GND
Low Voltage Pin to GND
OVP, COMP, SYNC, VSYNC, GSCLK, RSET, SDI, SDO,
SCLK, CS B, PLL, FLAUT, CSFB, CSFBi, CSFBo, ADDR0,
ADDR1 Voltage to GND
Maximum DC Output Current2
Maximum Junction Operating temperature
Maximum Soldering Temperature (at leads, 10 sec)
Value
45
-0.3 to 30
-0.3 to 35
-0.3 to 6.0
Units
V
-0.3 to V CC + 0.3
1800
-40 to +150
300
mA
°C
Thermal Information3
Symbol
ΘJA
PD
Description
Thermal Resistance4
Maximum Power Dissipation
Value
23
4.3
Units
OC/W
W
1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions other than the operating conditions
specified is not implied. Only one Absolute Maximum Rating should be applied at any one time.
2. Based on long-term current density limitation.
3. Mounted on an FR4 board.
4. Derate 23mW/°C above 25°C.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202307A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 24, 2012
5
5 Page 
Functional Block Diagram
AAT2400 (master)
LX
DATA SHEET
AAT2400/2401
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
FAULT
VIN
VCCIO
VCC
EN
OVP
COMP
SYNC
CSFB
PGND
SCLK
SDI
CSB
SDO
ADDR0
ADDR1
Linear
Regulator
PWM
Logic
Temperature Detect
Fau7lt-bCiot nDdoittioCnoRrreecptoiornting
87-7b-7b-7ib-t7ib-t7iDb-t7iDb-tioDb-tioDbttiDottiDoCttoDCtoDoCtooCtroCotrrCoterroCerroCcrerocrtreocierrtociretrocinertoctineocitnocitnointoinonn
717-27b-7-b-7ibb-t7ib-t7iiDb-ttiDb-tiDoDbtiDottiDeottoDCltaoDCtooCytoCotrCoTtrroCerroCirermocrreocerrteciretrociertoctineocitnocitnointoinonn
12-7b7-7ib-t7b-7iGb-t7ib-t7iDb-rtiDb-taioDbtiyDottiDottSoDCtoDCtcooCtaoCotrColtrreoCerroCrerocPrreocerrtWciretrociertoctineMocitnocitnointoinonn
16
CCoCConConCotnoCrtnCoortnootrnlortonlortnlortltorlrololl
8x31
8
CS8
CS7
CS6
CS5
CS4
CS3
CS2
CS1
VSYNC
PLL
GSCLK
RSET
4096 x PLL
Mux
DGND AGND
SGND
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202307A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 24, 2012
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AAT2401.PDF ] | |
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